Rear closure for truck mixers



y 11, 1933- c. F. BALL El AL 1,918,205

REAR CLOSURE FOR TRUCK MIXERS Filed May 17, 1930 2 Sheets-Sheet l Fig-1- 11 u 0 u u u u u u INVENTORS C'kas. EBall, a

BY 4 Q a ATTORNEYS July 11, 1933. Q R BALL ET AL 1,918,205

REAR CLOSURE FOR TRUCK MIXERS Filed May 17, 1930 2 Sheets-Sheet 2 BYfi ATTORNEYS Patented July 11, 1933 UNITED STATES PATENT OFFICE CHARLES F. BALL AND ARTHUR: E. MILLER, OFMILWAUKEE, WISCONSIN, AS SIGNORS K T CHAIN BELT COMPANY, OF MILNAUKEE, WISCONSIN, A CORPORATION OF WIS- CONSIN REAR CLOSURE FOR TRUCK MIXERS Application filed May 17, 1930. Scrial'No. 453,281.

This invention relates to Closures for concrete mixer drums,'and has for one of its objects to provide an improved closure of this character which is particularly, al-

I though not solely, adapted for use with transit concrete mixers.

A further object of the invention is to provide a closure for concrete mixers of the type having rotatable mixing drum provided with an axial discharge opening and a pivoted oscillating discharge chute 1novable into and out'of said o iening during the discharging and mixing periods respectively, which closure when in closing position rotates with the drum, and which is mounted to be mechanically swung axially and transversely of said opening out of the path of the discharge chute when it is d.e sire-d that the latter shall enter theopening to discharge the contents of the drum.

A further object of the invention is to so co-relate the closure and the discharge chute that the latter 'may be employed to positively hold the former in closing position over the opening during the mixing operation.

WVith the above and other objects in view, which will appear as the description proceeds, the invention consists in the novel details of construction and combinations of parts more fully hereinafter described and particularly pointed out in the appended claims.

Referring to the accompanying drawings forming a part of this specification, in-which like reference characters designate like parts in all the views Figure 1 is a rear end elevational, view of a well known form of transit concrete mixer with the present invention applied thereto,

the closure being shown open and the discharge chute in discharging position;

Figure 2 is a side elevational view of the 5 rear portion of the transit-mixer shown in Figure 1, the parts being shown in the mixing position, with the discharge chute holding the closure member in position over the discharge opening;

Figure 3 is a view similar to Figure 2,

. ciated parts 1n the discharging verse framework 15, and is adapted to be swung from non-discharging position, shown in Figure 2, to discharging position, shown in Figure 3, in any suitable manner, as by the worm wheel 16 carried by the shaft 13,, worm 17 meshing therewith, ac'tuatingshaft" 18, and hand wheel 19,all as will be readily understood from the drawings.

The closure member 20 for the discharge opening preferably takes the form of a flat circular plate or disk, secured at its center by the ball and socket joint 21 to a spindle 22, rotatably and slidably mounted in the hub or sleeve portion 23 of a bearing member 24, see Figure 4. The said bearing mem-. bcr 24, has an upwardly extending rigid arm 25. which has pivotally connected to it, as at 26'and 27 respectively, a pair of spaced parallel link elements 28 and 29. The link '28 is pivoted'to the top transverse member,

30 of the framework 15 as at 31, while the link element 29 is carried by a transverse shaft 32, journalled in the uprights 14 of the said framework. The said shaft 32 carries an arm 33, which is connected by a link 34 to an arm 35, rigid with the hand lever 36, which latter is journalled in abearing block 37 mounted on theframework.

The operation of the closure and its assoparts will be clear from the foregoing, taken in connection with the drawings, it being understood that with the parts in i the positions shown in Figure 2, the closure plate 20 prevents the unintentional discharge of the contents of the drum during the mixing operation. At this time the" dis- Q the disk 20 in place in the opening 11. A

spring 38, and a thrust bearing 39 are mounted within the sleeve 23, between the end of the spindle 22 and the cap 40 which closes tne end of the said sleeve, to cushion the force applied by the said chute to the disk, and toacconnnodateany in'equalitie. in the structure.

IVhen it is desired to discharge the contents of the drum, the discharge chute 12 is first moved slightly upwardly in acounterclockwise direction, to disengage it from the sleeve 23 to permit movement of the disk 20. The hand lever 36 is then moved in a counter-clockwise direction to the position shown in Figure 3, and through the .arm 35, link 34:,- arm 33, shaft 32, and link element 29 moves the bearing member 24: and disk 20 through an arc outwardly and upwardly from the opening 11' and out of the path of the discharge chute. The second link member 28 serves to keep the closure .20 and bearing member 24 substantially vertical during this movement, as will be readily understood. The discharge chute 12is then moved in a clockwise direction into the opening 11 to the position shown in Figure 3, whereupon the contents of the drum 10 will be discharged thereby in the usual and well known manner. I

If desired. the bearing block 37 may be provided with a rigid extension or stop Ail against which the arm 35 may engage when the partsare in the positions shown in Figure 3,. thus providing a toggle lock which will maintain the closure 20 in the position illustrated in the said figure. v

IVhile one formof the invention has been illustrated and described, it is obvious that those skilled in the art may vary the details of construction as well as the precise arrangement of parts without departing from .the spirit of the invention, and therefore it is not wished to be limited to the above disclosure except as may be required by the claims.

hat is claimed is:

1. In a concrete mixer and the like, a mixing receptacle having a discharge opening; a discharge chute mounted in close proximity to said opening for entrance therein and withdrawal therefrom; a closure member for said opening; nieansfor mounting said closure for simultaneous outward and upward movement from said opening with the closure member maintained substantially parallel to the plane of the opening, whereby interference between the closure member and the discharge chute is avoided; and means for moving said closure mounting means to bring the closure member into and out of said opening.

2. In a concrete mixer, a rotatable mixing drum having an axial discharge opening; a closure member for said opening; a bearing member rotatably mounting said closure member; a support; a plurality of parallel links mounting said bearing member on said support for oscillatory movement toward and from said opening with the axis of its bearing always maintained substantially parallel to or coincident with the axis of saiddrum; means for moving said bearing and closure members to and from closing position; and a toggle lock for holding the parts in open position.

3, In a concrete mixer and agitator having a receptacle provided with a discharge opening, and closure means for said opening mounted for movement thereto andtherefrom; the combination of discharge means mounted adjacent said opening for move ment into engagement with a portion of said closure means to maintain the latter in closing position relative to said opening.

4. In a concrete mixer and agitator h'aving a receptacle provided with a discharge opening, and closure means for said opening mounted for movement thereto and therefrom," the combination of discharge means mounted adjacent-said opening for movement into engagement with a portion of said closure means when the latter is in its closing position; and cushioning means between said closure and discharge means.

5. In a concrete mixer and agitator having adrum provided with an axial discharge opening, a closure member for said opening; an arm having meansrotatably mounting said closure member; a support; a transverse; shaft journalled on' said support; a link carried by said shaft and pivotally connected to said arm; a second link, pivotally secured at one end to said support and at the other end to said arm, said second link being, 1 spaced from and parallel to said first link; W and means for oscillating said shaft to move said links, arm and closure member to and from the closing position while maintaining the rotative axis of the closure member substantially parallel to or coincident with the axis of the drum. V

.6. In a concrete mixer and agitator having a drum provided with an'axial discharge opening, a closure member'for said opening; an arm having means rotatably mounting" said closure member; a support; a transverse shaft journalled'on said support; a link carried by said shaft and pivotally connected to said arm; a second link, pivotally secured lafi at one end to said support and at the other end to said arm, said second link being spaced from and parallel to said first link; means for oscillating said shaft to move said li ksarm and closure member to andfrom the closing position while maintaining the rotative axis of the closure member substantially parallel to or coincident with the axis of the drum; means for preventing unintenl tional movement of said shaft and the parts operated thereby when the closure member is in open position; a discharge member mounted adjacent said opening; and means for moving and maintaining said discharge member into engagement with a portion of said arm when the closure member is in closing position to maintain it therein.

In a concrete mixer, a mixing drum having a discharge opening; a rotatably 18 Y tures.

CHARLES F. BALL. ARTHUR E. MILLER. 

